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The type specimens of fossil “Architectibranchia” and   Cephalaspidea   (  Mollusca  :   Heterobranchia  ) deposited in the Academy of Natural Sciences of Philadelphia, USA, are listed herein. The collection includes types of circa 60 species, from the families:   Acteonellidae  ,   Acteonidae  ,   Bullidae  ,   Cylichnidae  ,   Haminoeidae  ,   Philinidae  ,   Retusidae  ,   Rhizoridae  ,   Ringiculidae   and   Scaphandridae  . The catalogue is presented in systematic order, with information on the original description, type locality, type stratum and age, catalog number in the collection, and current taxonomic status. Further taxonomic notes are offered when pertinent. Several species are illustrated here for first time. The new combinations    Roxania   hornii    (Gabb, 1864) and    Volvulella   minutissima    (Gabb, 1860) are proposed. Some species that have previously been assigned to   Acteonidae   are revised here, resulting in the following new combinations:    Odostomia   milium    (Lea, 1846),    Chrysallida   sculpta    (Lea, 1846) and    Pyrgulina   angulata    (Lea, 1846). The list of taxa is also presented in other arrangements (alphabetically by specific epithets and by authorship and date) to facilitate locating information.

zoosystematics and evolution

Type specimens of fossil “Architectibranchia” and   Cephalaspidea   (  Mollusca  ,   Heterobranchia  ) in the Academy of Natural Sciences of Philadelphia